SEXTANTE is a free library for Geospatial Analysis that includes a large set of geoprocessing tools. It contains more than three hundred algorithms for both raster and vector data processing. For most of them, contextual help has been prepared, which provides insight into the functionality of the tool.
In the current version of SEXTANTE it is possible to use an interface to the free software GRASS GIS and SAGA. Since august 2011 SEXTANTE can be also integrated into ArcGIS.
SEXTANTE can be improved by programmers to incorporate analysis functionalities into their software.
Although many innovations have been realized, the SEXTANTE project team members continue with new interesting ideas such as the integration of R, the powerful statistical software, into SEXTANTE.
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Sunday, October 30, 2011

An early preview of the upcoming gvSIG Community Edition 1.0 is available for download here.
It is not intended for use in a production environment. We expect that there are still missing features in this release. In particular, the following features are NOT YET included:

updated 32/64 bit binaries (raster drivers)

GRASS and SAGA GIS binaries (via SEXTANTE)

third-party extensions (e.g. OpenCAD, NavTable)

the new extensions manager tool

We have included a SEXTANTE snapshot from 08/28/2011. Functionalities of GRASS GIS and SAGA can be added to the SEXTANTE Toolbox following the instructions of this document. You will see all the available raster- and vector tools from SEXTANTE, SAGA, GRASS GIS and gvSIG CE which all together are currently 760 algorithms.
A continuously updated release announcement, detailing the progress on new features and bug fixes can be found here.
This is a zero-install distribution. Simply unpack it somewhere on your harddisk and start it: